PD Pusle Current Characteristics at PDIV Level of Mineral Oil

The aim of this paper is to describe the partial discharge (PD) pulse current characteristics of the mineral oil at the partial discharge inception voltage (PDIV) level. This paper represents the experimental investigation of the PD pulse current characteristics of the mineral oil with the water content about 4 ppm at the PDIV levels tested by various tip radii of needle – plane electrode arrangements. The tungsten needle electrodes with the tip radius of 10µm, 20µm, and 40µm respectively were used as the high voltage electrode while the brass plane electrode with 75 mm diameter was connected to the ground via the shunt resistor of 50 ohm. The gap distance of the electrode system was set up at 50 mm. Two PDIV test methods were performed to investigate PDIV of the mineral oil. The first…